ELCA evaluation for keyword search on probabilistic XML data

R. Zhou, C. Liu, Jianxin Li, J.X. Yu

    Research output: Contribution to journalArticle

    16 Citations (Scopus)


    As probabilistic data management is becoming one of the main research focuses and keyword search is turning into a more popular query means, it is natural to think how to support keyword queries on probabilistic XML data. With regards to keyword query on deterministic XML documents, ELCA (Exclusive Lowest Common Ancestor) semantics allows more relevant fragments rooted at the ELCAs to appear as results and is more popular compared with other keyword query result semantics (such as SLCAs). In this paper, we investigate how to evaluate ELCA results for keyword queries on probabilistic XML documents. After defining probabilistic ELCA semantics in terms of possible world semantics, we propose an approach to compute ELCA probabilities without generating possible worlds. Then we develop an efficient stack-based algorithm that can find all probabilistic ELCA results and their ELCA probabilities for a given keyword query on a probabilistic XML document. Finally, we experimentally evaluate the proposed ELCA algorithm and compare it with its SLCA counterpart in aspects of result probability, time and space efficiency, and scalability. © 2012 Springer Science+Business Media, LLC.
    Original languageEnglish
    Pages (from-to)171-193
    JournalWorld Wide Web
    Issue number2
    Publication statusPublished - 2013

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